File IO in c++ 1

 Posted on August 31, 2010  (Last modified on August 7, 2020)  |  15 minutes  |  Kinshuk Chandra

Introduction This tutorial will start with the very basis of File I/O (Input/Output) in C++. After that, I will look into aspects that are more advanced, showing you some tricks, and describing useful functions. You need to have good understanding of C++, otherwise this tutorial will be unfamiliar and not useful to you! Your Very First Program I will first write the code, and after that, I will explain it line by line. [Read More]
cpp  File handling  kodeknight  fileRead  fileIO 

Reading from file or Reading integers from file

 Posted on August 4, 2010  (Last modified on August 7, 2020)  |  1 minutes  |  Kinshuk Chandra

#include
#include
#include
#include

using namespace std;

int main() {
    int sum = 0;
    int x;
    ifstream inFile;

    inFile.open(“integers.txt”); // read integers from text file
    if (!inFile) {
        cout « “Unable to open file”;
        exit(0); // terminate with error
    }

while (inFile » x) {
        sum = sum+x;
    }
    inFile.close();

cout « “Sum = " « sum « endl;
    return 0;
}

File handling  kodeknight  fileRead  programCPP  fileIO 

File Handling in c

 Posted on December 7, 2009  (Last modified on August 7, 2020)  |  4 minutes  |  Kinshuk Chandra

/* Program to create a file and write some data the file */ #include #include main( ) { FILE *fp; char stuff[25]; int index; fp = fopen(“TENLINES.TXT”,“w”); /* open for writing */ strcpy(stuff,“This is an example line."); for (index = 1; index <= 10; index++) fprintf(fp,"%s Line number %d\n”, stuff, index); fclose(fp); /* close the file before ending program */ } FILE * fopen(char * filename, char * mode) The mode value in the above example is set to ‘r’, indicating that we want to read from the file. [Read More]
File handling  kodeknight  c 

Error handling

 Posted on December 7, 2009  (Last modified on August 7, 2020)  |  1 minutes  |  Kinshuk Chandra

The standard I/O functions maintain two indicators with each open stream to show the end-of-file and error status of the stream. These can be interrogated and set by the following functions: #include void clearerr(FILE *stream); int feof(FILE *stream); int ferror(FILE *stream); void perror(const char *s); Clearerr clears the error and EOF indicators for the stream. Feof returns non-zero if the stream’s EOF indicator is set, zero otherwise. Ferror returns non-zero if the stream’s error indicator is set, zero otherwise. [Read More]
File handling  kodeknight 

Random access functions

 Posted on December 7, 2009  (Last modified on August 7, 2020)  |  3 minutes  |  Kinshuk Chandra

The file I/O routines all work in the same way; unless the user takes explicit steps to change the file position indicator, files will be read and written sequentially. A read followed by a write followed by a read (if the file was opened in a mode to permit that) will cause the second read to start immediately following the end of the data just written. (Remember that stdio insists on the user inserting a buffer-flushing operation between each element of a read-write-read cycle. [Read More]
File handling  kodeknight 

File handling in cpp

 Posted on December 7, 2009  (Last modified on August 7, 2020)  |  7 minutes  |  Kinshuk Chandra

File I/O with Streams: Many real-life problems handle large volumes of data, therefore we need to use some devices such as floppy disk or hard disk to store the data. The data is stored in these devices using the concept of files. A file is a collection of related data stored in a particular area on the disk. Programs can be designed to perform the read and write operations on these files. [Read More]
cpp  File handling  kodeknight